By switching build_nuke() to sector_can_build(), build_charge().
Changes reporting of missing stuff to be like for ships, planes and
land units:
* Report missing available work, or else missing materials, or else
missing money instead of materials, or else money, or else work.
* Report what materials are missing instead of how much materials have
to be there.
* Clean up stray ';' in reporting of missing work.
Signed-off-by: Markus Armbruster <armbru@pond.sub.org>
Markus Armbruster
1c0315048a